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JBL 4642A-GS - 4 ohm, Dual 18" Bass Reflex Subwoofer System with Grille

JBL 4642A-GS - 4 ohm, Dual 18" Bass Reflex Subwoofer System with Grille


 
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Product Code : 4642A-GS
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Description
 

JBL 4642A-GS - 4 ohm, Dual 18" Bass Reflex Subwoofer System with Grille


JBL 4642A-GS
The JBL Model 4642A is a high quality subwoofer system, featuring an advanced technology 460 mm (18 in), low frequency transducers mounted in a direct radiator, bass-reflex enclosure for smooth response to the lowest audible frequencies. The 4642A is ideal for low-frequency augmentation of either analog or digital soundtracks in motion picture theaters and for general sound reinforcement applications.

Transducer:
The 2241H transducer utilizes the patented Vented Gap Cooling (VGC) process*, which pumps air through the magnetic gap and directly over and around the voice coil, providing immediate heat transfer and a reduction in operating temperature. This increases power handling while reducing power compression.

Through the use of computer-aided magnet optimization and analysis techniques, JBL engineers were able to optimize magnet weight, flux density and field saturation, resulting in a 2.6 kg (6.5 lb) reduction in overall driver weight and a significant reduction in harmonic distortion. This magnet structure offers much of the weight advantage of rare earth magnet structures without the prohibitive cost, enabling the system to carry a 1200 watt continuous AES pink noise power rating.

Features:

  • 1200 Watts Continuous Pink Noise, 2400 Watts Continuous Program Power Handling
  • Usable response to 22 Hz (-10 dB, no EQ), flat to 22 Hz (-3 dB) with External EQ
  • 2241H VGCTM Vented Gap Cooled Drivers- High Sensitivity- Low Power Compression- High Maximum-SPL Capability- Low 2nd and 3rd Harmonic- Distortion- Symmetrical Field Geometry SFGTM- Magnet Structure- Long Excursion Capability
  • Approved by Lucasfilm, Ltd. for THX installations

Specifications:

TRANSDUCERS: Two JBL Model 2241H 460 mm (18 in) Low Frequency Transducers

SYSTEM:
  • Rated Impedance: 4 ohms
  • Minimum Impedance: 3.2 ohms

POWER HANDLING CAPABILITY:

  • Continuous Pink Noise: 1200 Watts
  • Continuous Program: 2400 Watts
  • Peak Power: 4800 Watts

OUTPUT CAPABILITY:

Axial Sensitivity:50 Hz to 500 Hz; 101 dB, 1W @ 1m40 Hz to 100 Hz; 100 dB, 1W @ 1m

Power Compression:
At -10 dB power (120 W): 0.8 dB
At -3 dB power (600 W): 2.6 dB
At rated power (1200 W): 4.3 dB

FREQUENCY RESPONSE:
Lower Frequency Limits (no EQ):-10 dB: 22 Hz-3 dB: 35 Hz
Lower Frequency Limits (with EQ):-10 dB: 20 Hz-3 dB: 22 Hz

Recommended Crossover Frequencies:
High-pass: 20 Hz, 12 dB/octave or greater
Low-pass: 80 Hz to 150 Hz, 12 dB/octave or greater

Distortion:
2nd harmonic: <2%
3rd harmonic: <2%

System Polarity: EIA Standard. Positive voltage to RED terminal produces forward cone motion.

Input Connectors: Color-coded push terminals

Net Weight: 98 kg (216 lbs.)

Shipping Weight: 109 kg (240 lbs.)

ENCLOSURE:
  • Materials and Finish: 19 mm (3/4 in) particle board with 25 mm (1 in) baffle and back panel. Extensive bracing on all panels
  • Enclosure Tuning Frequency: 25 Hz
  • Net Internal Volume: 506 liters (18 cu. ft)
  • Dimensions: 762 mm x 1219 mm x 610 mm, H x W x D 30 in x 48 in x 24 in


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